This is an easy way to make a simple abstract graphic. You don`t need much experience with Photoshop to do this.
Open up Adobe Photoshop. Create a new document. Mine is 300x300px. Set your foreground color to black and your background color to white. Select the Gradient tool in your Tool Box. It should look like this

If it is not in your toolbox, right click the Paint Bucket Tool and select Gradient tool.
Now, on your top toolbar, select the Linear Gradient tool. Put the mode to difference. By default, dither and transparency should be selected.
Now go to your document and created lines in any direction. Don`t get carried away. This is what I got
Now for the color. Go to your layers palette and on the bottom, you`ll see buttons. Select the button that looks like a Ying-Yang sign. A half white, half black circle. Now select Color Balance.

A window like this should pop up.

Just play around with the numbers until you get a nice color. Then all you have to do is add text and viola, you`re done!
Here`s what I got

Pretty ^^
Hope that helped.
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